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Old 10-19-2005, 06:24 PM   #1
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Specific Gravity question...

So, I owned the plastic arm hydrometer which has been reading sg of 1.023 - - I just got a refractometer today. It is giving me a reading of 1.029!!!! Oooof! If my hydrometer was really that far off, would things survive? Maybe this might explain the disappearance of 2 peppermint shrimp.

Anyway, I tested ro/di water and it did read at 0, so I'm assuming the refracto is correct.

I guess my question is - how dangerous is 1.029? I'll be lowering it slowly over the next couple days. Oh, and would high sg promote hair algae growth?

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Old 10-19-2005, 07:37 PM   #2
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The .006 differece isnt really that big of a deal. Expecially since most of your inhabitants have been living at that SG for most likly quite some time. What is more of a problem is wild changes in salinity. If the salinity was changing that much daily than thats a different story. Our inhabitants will adjust to very high salinities I have heard of some living in SW as high as 1.040. This is usually a very high extreme thts the result of substantal evaporation with our replacment water being added.

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Old 10-19-2005, 08:19 PM   #3
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Actually the hazard to inverts would be too low of a salanity. You'll want to test the accuracy with distilled not RO/DI.

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Old 10-19-2005, 10:11 PM   #4
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You should be fine. Just make sure you lower it slowly.
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gravity, spec, specific gravity

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